Royal Purple any good?
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http://www.amsoil.com/lit/g3115.pdf
Amsoil published this "Study of SAE 5W-30 Synthetic Motor Oils" back in 2013 which features a comparison of the following synthetic oils:
AMSOIL Signature Series Synthetic Motor Oil
Castrol Edge® with Titanium Fluid Strength Technology®
Lucas Synthetic
Mobil 1™ Extended Performance
Pennzoil Ultra™
Petro-Canada SUPREME Synthetic™
Quaker State Ultimate Durability™
Red Line High Performance Motor Oil
Royal Purple High Performance Motor Oil
Valvoline SynPower® Full Synthetic Motor Oil
Amsoil published this "Study of SAE 5W-30 Synthetic Motor Oils" back in 2013 which features a comparison of the following synthetic oils:
AMSOIL Signature Series Synthetic Motor Oil
Castrol Edge® with Titanium Fluid Strength Technology®
Lucas Synthetic
Mobil 1™ Extended Performance
Pennzoil Ultra™
Petro-Canada SUPREME Synthetic™
Quaker State Ultimate Durability™
Red Line High Performance Motor Oil
Royal Purple High Performance Motor Oil
Valvoline SynPower® Full Synthetic Motor Oil
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